CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 17,968	$ 15,160	$ 34,140	$ 28,780
Other comprehensive income net of tax:
Unrealized holding gain (loss) on securities available for sale arising during the period, net of tax of $2,904, $3,149, $2,376 and $5,953	$ (5,393)	5,849	$ (4,413)	11,055
Unrealized gain on securities available for sale for which a portion of an other than temporary impairment has been recognized in income, net of tax of $290 and $916		538		1,702
Unrealized gain (loss) on cash flow hedges arising during the period, net of tax of $282, $452, $165 and $895	$ 525	(840)	$ (304)	(1,663)
Reclassification adjustment for gains (losses) included in net income, net of tax of $158, $172, $77 and $256	293	(321)	(143)	(474)
Period change	(4,575)	5,226	(4,860)	10,620
Comprehensive income	$ 13,393	$ 20,386	$ 29,280	$ 39,400